Name for one kind of Czerny-Turner monochromator configuration?

In summary, the conversation was about the specific name for a configuration of the Czerny-Turner monochromator where the two mirrors, M1 and M2, combine to form one monolithic mirror with a single radius of curvature. The person was trying to reference this design for an old project they were revisiting. It was mentioned that the name of this configuration is also known as Fastie-Ebert monochromator or Ebert-Fastie monochromator. The person also shared their familiarity with three different configurations of this monochromator.
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TL;DR Summary
searching for name of single-mirror C-T monochromator configuration
Can anyone say if there is a specific name for the Czerny-Turner monochromator configuration shown below, but specifically when the two mirrors M1 and M2 extend into each other and combine forming one monolithic mirror M12 with one single radius of curvature? I thought I saw such a design years ago, and I'm revisiting an old project in which I'm actually trying to build it, but it would help to reference any existing work.

Czerny-Turner-monochromator.png

this figure is taken from www.researchgate.net/figure/Czerny-Turner-monochromator-S-1-and-S-2-entrance-and-exit-slits-respectively-G_fig3_36449863

20230311_CT-mono1.jpg

remains of previous experiment
 
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  • #2
Nevermind: apparently, the name I was looking for was Fastie–Ebert monochromator.
 
  • #3
Welcome to PF.
Where if you can express yourself clearly, and ask the right question, you can answer it yourself.
We look forward to your next good question, and an introduction to another interesting esoteric device.
 
  • #4
jbeale said:
Nevermind: apparently, the name I was looking for was Fastie–Ebert monochromator.

I'm more familiar with it being called Ebert-Fastie, or simply Ebert.

Below are three configurations I am most familiar with.

1-s2.0-B9780123860224000030-f03-10-9780123860224.jpg

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